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We picked up this tool to make sure the second hand stringing machine we recently purchased was properly calibrated. Its' usage is very simple in theory. You hook either end up to the stringer and set the tension to 50 pounds and see what reading is shown on the tool. We also tried it at 30 pounds and 60 pounds to see if the results were consistent. The problem is the tension calibrator has a very small scale for showing the tension. It is only marked at 20 pound increments with lines at the intermediate 5 pound increments. Each of the 5 pound lines is about 3/32 of an inch apart. This makes it hard to read to get an exact calibration. This is compounded by the fact that many stringing machines have settings at 3 pound increments. This tool would be so much more efficient if it had a digital readout instead. That would lead to a much more effective calibration machine, one that was better suited for the digital age.
Items works well enough and helps you get an idea of where your machine is at. My stringer was approx. 4 - 6 pounds lighter than the actual gauge setting. So my 55 lbs setting was only about 50(ish) lbs. The Calibrator isn't as detailed as I wish it was, for example the reading go from 40 lbs to 50 lbs with 5 dashes/markers between and a little hard to read. Makes me wonder how accurate the tension calibrator really is?? It's basically a metal cylinder with a spring in the middle and two connectors at each end.
As far as I can tell it's accurate, but I don't have anything else to verify it. I used it on a brand new lockout stringer that was calibrated at the factory and it was dead on. I would assume the factory calibrated the stringer accurately so it seems like the Gamma calibrator works perfectly.